What enzyme breaks down hydrogen peroxide to harmless substances in peroxisomes?
A) coagulase.
B) hemolysins.
C) leukocidin.
D) catalase.
Ans: D) catalase.
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Which one of the following nucleotides could base pair with a pyrimidine?
A. uracil B. cytosine C. adenine D. thymine E. uracil, cytosine, adenine and thymine
Enzymes ____
a. change the rate of a reaction b. change the direction of a reaction c. change the free energy of a reaction d. are used up in a reaction e. are present in concentrations approaching their substrates' concentrations
Oxpeckers have long been thought to have a mutualistic relationship with cattle in Zimbabwe, whereby the birds remove ticks from the backs of cattle, and the cattle benefit due to the removal of parasitic ticks
The observational experiments of Weeks (2000 ) in Zimbabwe demonstrated that the relationship between oxpeckers and cattle was not mutualistic, but in fact parasitic. What two oxpecker behaviors did Weeks observe?
An organism that is neither prokaryotic nor photosynthetic, and must obtain its nutrients by secreting digestive
enzymes into the environment, belongs to which group of organisms? a. Bacteria b. protists
c. Fungi d. Plantae e. Animalia